WPF, 'Object reference not set to an instance of an object' in Designer

Question

I\'m getting an \"Object reference not set to an instance of an object\" error when I try to reload the Designer for my XAML UserControl. Visual Studio highlig

Answer 1

It's probably something in the constructor of your user controls. VS2008 WPF designer appears have some issues with this.

In a project we took over, we added:

if (System.ComponentModel.DesignerProperties.GetIsInDesignMode(this))
{
    return;
}

to the beginning of the constructor of the user controls where this happens to avoid that error.